Pitch angle adjusting mechanism and fan

Abstract

The utility model relates to a pitch angle adjusting mechanism which comprises a base, an adjusting disc is rotationally installed on the base, the outer edge of the adjusting disc comprises a gear part and a locking arc part, an adjusting groove is fixedly formed in the position, beside the adjusting disc, of the base, and one end of a first elastic piece is fixedly installed at the bottom of the adjusting groove; an adjusting bead is fixedly mounted at the other end of the first elastic piece and is slidably connected to a tooth gap corresponding to the gear teeth of the gear part; a limiting groove is formed in the locking arc part, a limiting block matched with the limiting groove is fixedly installed at the position, corresponding to the limiting groove, of the base, and the adjusting disc is round. The technical problems that when a user manually adjusts the fan with the pitch angle adjusting range, a pitch angle adjusting mechanism of the fan is damaged due to the fact that force is too large, and the pitch angle of the fan cannot be continuously adjusted and even cannot be directly used are solved.

Description

Technical Field

[0001] The present application relates to the field of fan technology, and in particular to a pitch angle adjustment mechanism and a fan. Background Art

[0002] In modern society, fans are a common ventilation and cooling device, widely used in homes, offices, and industrial settings. Traditional fans typically have a fixed mounting position and fixed airflow direction, which limits their use and effectiveness. To improve fan flexibility and applicability, various fan designs with adjustable airflow direction have emerged on the market. Among them, the pitch angle adjustment mechanism is a key component in achieving this function.

[0003] The pitch angle adjustment mechanism allows the user to adjust the pitch angle of the fan head as needed, thereby changing the direction and coverage of the air blowing. At present, for the sake of simple operation and low price, most fans use a manual angle adjustment mechanism. However, for fans with limited pitch angle adjustment, the pitch angle adjustment mechanism of the fan may be damaged due to excessive force during the user's operation to adjust the fan pitch angle, resulting in the fan being unable to continue to adjust the pitch angle or even being unusable. Utility Model Content

[0004] The present application provides a pitch angle adjustment mechanism and a fan to solve the technical problem that when a user manually adjusts a fan with a pitch angle adjustment range, the pitch angle adjustment mechanism of the fan is damaged due to excessive force, resulting in the fan being unable to continue adjusting the pitch angle or even being unusable.

[0005] In the first aspect, the present application provides a pitch angle adjustment mechanism, comprising: a base, on which an adjustment disk is rotatably mounted, the outer edge of the adjustment disk includes a gear part and a locking arc part, an adjustment slot is fixedly mounted on the base next to the adjustment disk, one end of a first elastic member is fixedly mounted on the bottom of the adjustment slot, and an adjustment bead is fixedly mounted on the other end of the first elastic member, and the adjustment bead is slidably connected to the tooth gap corresponding to the gear teeth of the gear part; a limiting slot matching the limiting slot is opened on the locking arc part, and a limiting block is fixedly mounted on the base at the corresponding position of the limiting slot, and the adjustment disk is circular.

[0006] In the second aspect, the present application provides a fan that adopts the above-mentioned pitch angle adjustment mechanism, the fan includes a fan head, a fan seat and an internal hollow support rod for connecting the fan head and the fan seat, the pitch angle adjustment mechanism is installed in the support rod, the base is installed on the side wall inside the support rod close to the fan head, a connecting hole is opened on the side wall of the support rod where the adjustment disk is located, and a connecting rod is fixedly installed on the fan head, and the connecting rod is fixedly connected to the adjustment disk.

[0007] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0008] The pitch angle adjustment mechanism provided in an embodiment of the present application includes a base, on which a circular adjustment disk is rotatably mounted to ensure that the adjustment disk can rotate relative to the base. The adjustment disk is divided into a gear portion and a locking arc portion. An adjustment slot is fixedly mounted on the base on one side of the adjustment disk. One end of a first elastic member is fixedly mounted at the bottom of the adjustment slot, and an adjustment bead is fixedly mounted on the other end of a second elastic member. The adjustment bead is slidably connected to the tooth gap of the gear teeth of the gear portion. The adjustment disk is fixed by the cooperation between the adjustment bead and the tooth gap. A limiting slot is provided in the locking arc portion, and a limiting block is fixedly mounted on the base at the position of the limiting slot. The cooperation between the limiting slot and the limiting block can limit the rotation arc of the adjustment disk. The pitch angle of the fan can be adjusted by the cooperation between the spring, the adjusting bead and the gear portion. At the same time, the cooperation between the limiting slot and the limiting block can limit the adjustment range of the fan's pitch angle, thereby preventing the adjustment disk from rotating beyond the range due to excessive force, thereby rotating the locking arc portion to the corresponding position of the adjustment slot, thereby preventing damage to the fan's pitch angle adjustment mechanism.

[0009] When the above-mentioned pitch angle adjustment mechanism is applied to a fan, the fan includes a fan head, a fan seat and a support rod for connecting the fan head and the fan seat. The pitch angle adjustment mechanism is installed in the support rod, and the base of the pitch angle adjustment mechanism is installed on the side wall inside the support rod on the side of the support rod close to the fan head. Then, a connecting hole is opened on the side wall of the support rod, and a connecting rod is fixedly installed on the outer wall of the fan head. The connecting rod is fixedly connected to the adjustment disk through the connecting hole, thereby realizing the adjustment of the pitch angle of the fan head. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0012] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0013] Figure 1 A schematic diagram of the main structure of a pitch angle adjustment mechanism provided in an embodiment of the present application;

[0014] Figure 2 A side structural diagram of a pitch angle adjustment mechanism provided in an embodiment of the present application;

[0015] Figure 3 A schematic cross-sectional view of a fan according to an embodiment of the present application;

[0016] Figure 4 A schematic diagram of the main structure of a fan support rod and pitch angle adjustment mechanism provided in an embodiment of the present application;

[0017] Figure 5 A schematic side view of a fan support rod and pitch angle adjustment mechanism provided in an embodiment of the present application;

[0018] Figure 6 A schematic cross-sectional structure diagram of a fan head and a support rod of a fan provided in an embodiment of the present application;

[0019] Figure 7 A schematic diagram of the bottom view of a fan head of a fan provided in an embodiment of the present application;

[0020] Figure 8 A schematic diagram of the bottom view of a fan head of a fan provided in an embodiment of the present application;

[0021] Figure 9 A schematic diagram of the main structure of a fan head of a fan provided in an embodiment of the present application;

[0022] Figure 10 A schematic structural diagram of an air supply mechanism of a fan provided in an embodiment of the present application;

[0023] Figure 11 A schematic cross-sectional view of a fan base of a fan provided in an embodiment of the present application;

[0024] Figure 12 A schematic structural diagram of a fan base plate provided in an embodiment of the present application;

[0025] Figure 13 A schematic structural diagram of a rotation drive mechanism of a fan provided in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] Base 101, adjustment disk 102, gear part 1021, locking arc part 1022, limiting groove 1023, limiting block 103, adjustment groove 104, first elastic member 105, adjusting bead 106, fixing cavity 107, first cavity 1071, second cavity 1072, second elastic member 108, positioning bead 109, support rod 201, fixing groove 202, connecting hole 203, clamping block 204, housing 301, Mounting platform 3011, air outlet 302, first air inlet 303, second air inlet 304, filter 305, mounting bracket 306, motor 307, rotating shaft 308, fan blades 309, positioning cavity 310, connecting rod 311, shell 401, snap-in groove 4011, bottom plate 402, driving wheel 403, mounting plate 404, driving wheel 405, driving motor 406, connecting port 407, bracket 501. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0030] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0031] In order to solve the technical problem in the prior art that when a user manually adjusts a fan with a pitch angle adjustment range, the pitch angle adjustment mechanism of the fan is damaged due to excessive force, resulting in the fan being unable to continue adjusting the pitch angle or even directly becoming unusable, the present application provides a pitch angle adjustment mechanism and a fan, which can avoid damage to the pitch angle adjustment mechanism due to excessive rotation when adjusting the pitch angle of the fan.

[0032] Figure 1A pitch angle adjustment mechanism provided in an embodiment of the present application includes a base 101, on which a circular adjustment disk 102 is rotatably mounted, the outer edge of the adjustment disk 102 includes a gear portion 1021 and a locking arc portion 1022, similar to an incomplete gear, and an adjustment slot 104 is fixedly mounted on the base 101 on one side of the adjustment disk 102, in which a first elastic member 105 is mounted, one end of the first elastic member 105 is fixedly mounted on the bottom of the adjustment slot 104, and an adjustment bead 106 is fixedly mounted on the other end of the first elastic member 105, the first elastic member 105 and the adjustment bead 106 extend out of the adjustment slot 104, the adjustment bead 106 is slidably connected to the tooth gap of the gear portion 1021 of the adjustment disk 102, and the adjustment disk 102 can be fixed by cooperating with the adjustment bead 106 and the tooth gap. In the embodiment of the present application, the gear portion 1021 is not fixed. The tooth gap and the size of the gear teeth are limited, and the corresponding adjusting disk 102 can be selected according to actual needs. In the process of adjusting the pitch angle, the fan can be adjusted to different pitch angles by adjusting the bead 106 and the tooth gap. At the same time, a limiting groove 1023 is provided in the locking arc part 1022 of the adjusting disk 102, and a limiting block 103 that cooperates with the limiting groove 1023 is fixedly installed on the base 101 corresponding to the position of the limiting groove 1023. It can be understood that the gear part 1021 and the locking arc part 1022 constitute the outer edge of the adjusting disk 102, and the limiting groove 1023 corresponds to the locking arc part 1022. Therefore, the two ends of the limiting groove 1023 correspond to the two end points of the gear part 1021. The gear part 1021 can achieve adjustment of different pitch angles, and the locking arc part 1022 can limit the maximum range of adjustment of the pitch angle.

[0033] like Figure 2 As shown, the present application also provides a fan, including the pitch angle adjustment mechanism as described above, and also including a fan head, a fan seat and a support rod 201 for connecting the fan head and the fan seat, the support rod 201 is hollow, the pitch angle adjustment mechanism is installed in the support rod 201, the base 101 of the pitch angle adjustment mechanism is installed on the side wall inside the support rod 201 on the side of the support rod 201 close to the fan head, and a connecting hole 203 is opened on the side wall of the support rod 201 where the adjustment disk 102 is located, and a connecting rod 311 is fixedly installed on the fan head, and the connecting rod 311 passes through the connecting hole 203 and is fixedly connected to the adjustment disk 102.

[0034] The fan head includes a housing 301 and an air supply mechanism installed inside the housing 301. The air supply mechanism includes a motor 307, a fan blade 309 and a rotating shaft 308. The output shaft of the motor 307 is fixedly connected to the rotating shaft 308. The fan blade 309 is fixedly installed on the rotating shaft 308. An air inlet and an air outlet 302 are provided on the housing 301 of the fan head. The air inlet includes a first air inlet 303 and a second air inlet 304. The air outlet 302 is provided at the top of the housing 301. The first air inlet 303 is provided on the outer side wall. The second air inlet 304 is provided at the bottom of the housing 301. In order to prevent the airflow from entering the fan head from the air outlet 302, Internally, the first air inlet 303 is opened at the lower part of the outer shell 301, the air supply mechanism is installed inside the outer shell 301 at the upper end of the first air inlet 303, and a mounting bracket 306 is fixedly installed on the inner wall of the outer shell 301. The motor 307 of the air supply mechanism is fixed on the mounting bracket 306, and a filter 305 is fixedly installed inside the outer shell 301 corresponding to the first air inlet 303. A mounting platform 3011 is fixedly installed at the bottom end of the inner wall of the outer shell 301, and the filter 305 is fixed on the mounting platform 3011. The height of the filter 305 is consistent with the height of the first air inlet 303, so as to complete the filtering of the airflow entering the first air inlet 303.

[0035] After the fan head and the support rod 201 are fixedly connected by the connecting rod 311 and the adjusting disk 102, a positioning cavity 310 is fixedly installed on the outer wall of the fan head housing 301 at the top of the connecting rod 311. The inner diameter of the positioning cavity 310 is consistent with the outer diameter of the support rod 201, so that the support rod 201 can be fixed in the positioning cavity 310. After the support rod 201 is fixed in the positioning cavity 310, the fan head is in a state perpendicular to the ground. At this time, when the pitch angle of the fan head needs to be adjusted, the support rod 201 and the positioning cavity 310 need to be separated. Therefore, The connecting hole 203 on the side wall of 201 is opened along the axial direction of the support rod 201, and the length of the connecting hole 203 is greater than or equal to the height of the positioning cavity 310, and the pitch angle adjustment mechanism is movably installed on the side wall of the support rod 201. Therefore, when the fan head is lifted upward, the pitch angle adjustment mechanism installed in the support rod 201 can be driven to move synchronously through the connecting rod 311. In order to ensure that the fan head can be fixed in position after being lifted to ensure convenient operation when adjusting the pitch angle, a fixed screw perpendicular to the axial direction of the support rod 201 is fixed on the base 101 of the pitch angle adjustment mechanism. The fixing cavity 107 is provided, and fixing grooves 202 corresponding to the fixing cavity 107 are provided on the inner walls of the support rods 201 on both sides of the base 101. In order to ensure high stability between the base 101 and the support rods 201, the fixing grooves 202 are provided on the inner walls of the support rods 201 on both sides of the base 101. A second elastic member 108 is provided in the fixing cavity 107, and a positioning bead 109 is fixedly installed on the second elastic member 108. The positioning bead 109 is fixed in the fixing groove 202 by the second elastic member 108 to achieve the fixation of the base 101. The fixing grooves 202 are provided on both sides of the base 101. The inner wall of the support rod 201 can ensure that the base 101 is subjected to the same force on the left and right sides of the support rod 201 when the base 101 is fixed, thereby ensuring its stability; and the fixing grooves 202 opened on the inner wall of the support rod 201 include at least two groups, and the distance between the two groups of fixing grooves 202 is greater than or equal to the height of the positioning cavity 310 and less than or equal to the length of the connecting hole 203, so as to ensure that when the fan head is moved, the positioning cavity 310 can be completely detached from the support rod 201, and the cooperation between the fixing grooves 202 and the fixing cavity 107 can be within the adjustment range of the fan head.

[0036] In the embodiment of the present application, the relative fixation between the pitch angle adjustment mechanism and the support rod 201 is achieved by the fixing cavity 107 and the fixing groove 202. The second elastic member 108 is placed in the fixing cavity 107, and then the positioning beads 109 are fixedly installed at both ends of the second elastic member 108. The positioning beads 109 are fixed in the fixing groove 202 by the second elastic member 108. This can be achieved by a second elastic member 108 and two positioning beads 109. Another achievable method is to fix a partition perpendicular to the axial direction of the fixing cavity 107 inside the positioning cavity 310. The partition divides the fixing cavity 107 into a first cavity 1 071 and the second cavity 1072, the partition serves as the bottom of the first gun and the second cavity 1072, there are two second elastic members 108, and two positioning beads 109. One end of one second elastic member 108 is fixedly mounted on the partition at the bottom of the first cavity 1071, and one end of the other second elastic member 108 is fixedly mounted on the partition at the bottom of the second cavity 1072. The positioning beads 109 are respectively fixedly mounted on the free ends of the two elastic members, and the positioning beads 109 are abutted against the fixing groove 202 by the second elastic member 108 to realize the relative fixation of the pitch angle adjustment mechanism and the support rod 201, thereby realizing the relative fixation of the position of the fan head.

[0037] In the embodiment of the present application, the fan head of the fan includes a base plate 402, a shell 401 and a rotation drive mechanism installed between the shell 401 and the base plate 402. The 360-degree rotation of the fan is realized by the rotation drive mechanism. The support rod 201 is fixedly connected to the shell 401, and a clamping block 204 is fixedly installed at the bottom of the side wall of the support rod 201 near the fan base 101 and the fan head. A clamping groove 4011 matching the clamping block 204 is opened on the side wall of the shell 401. The coordination between the clamping block 204 and the clamping groove 4011 enhances the stability of the fixation of the support rod 201 and the fan base 101, and the clamping groove 4011 is fixedly installed at the bottom of the side wall of the support rod 201 near the fan base 101 and the fan head. The arrangement of 011 and the clamping block 204 can play a positioning role when installing the shell 401; the rotating drive mechanism between the shell 401 and the base plate 402 includes a drive motor 406, a driving wheel 405 and a driving wheel 403, the driving wheel 403 is fixedly mounted on the base plate 402, and a mounting plate 404 is fixedly mounted inside the shell 401, the drive motor 406 is fixedly mounted on the mounting plate 404, the driving wheel 405 is fixedly mounted on the output shaft of the drive motor 406, the driving wheel 405 and the driving wheel 403 are engaged with each other, and the number of teeth of the driving wheel 403 is greater than the number of teeth of the driving wheel 405, and the shell 401 and the base plate 402 are rotationally connected. During the operation of the fan, the driving motor 406 drives the active wheel 405 to rotate. The driving wheel 403 is fixedly mounted on the base plate 402, so the driving wheel 403 is in a fixed state. When the active wheel 405 rotates driven by the driving motor 406, it engages with the driving wheel 403 and rotates around the driving wheel 403, thereby driving the shell 401 to rotate, and the rotation of the fan head is realized through the connection of the support rod 201. In this process, the active wheel 405 simultaneously completes the actions of self-rotation and revolution around the driving wheel 403, thereby realizing 360-degree rotation and air supply of the fan.

[0038] In the embodiment of the present application, the first elastic member 105 and the second elastic member 108 can be elastic objects such as springs and elastic blocks.

[0039] In the embodiment of the present application, a connection port 407 is provided at the bottom end of the base plate 402, and a bracket 501 is also included. The bracket 501 is connected to the connection port 407 to realize the detachable installation of the bracket 501 and the fan. The installation of the bracket 501 can use the fan as a standing fan. After the bracket 501 is removed, the fan can be used as a table fan or a wall-mounted fan. In order to enhance the stability of the fan when used as a standing fan, the bracket 501 can be a triangular bracket, and the connection port 407 at the bottom end of the base plate 402 can be a threaded hole. A threaded rod is provided on the bracket 501, and the bracket 501 and the fan are installed by matching the threaded rod and the threaded hole. Alternatively, a magnet can be fixedly installed in the connection port 407. The bracket 501 is made of magnetic material, and the bracket 501 is installed by mutual magnetic attraction.

[0040] In the embodiment of the present application, the pitch angle adjustment range of the fan head can be 0-180 degrees, that is, the angle of the gear portion 1021 of the adjustment disk 102 is 180 degrees, and the angle of the locking arc portion 1022 is also 180 degrees. The gear portion 1021 cooperates with the first elastic member 105 in the adjustment groove 104 and the cooperation rotation angle between the limit groove 1023 and the limit block 103 is in the same direction to ensure that the adjustment disk 102 can rotate, such as Figure 1 As shown, in order to prevent the adjusting disk 102 from over-rotating, one feasible method is to use the position of the adjusting slot 104 as the starting point of the gear portion 1021 and the end point of the locking arc portion 1022, and use the position of the limit block 103 as the end point of the gear portion 1021 and the starting point of the locking arc portion 1022. When the adjusting disk 102 is rotated, the rotation angle of the adjusting disk 102 can be limited by the cooperation between the limit block 103 and the limit slot 1023.

[0041] Specific implementation process:

[0042] The initial state of the fan is that the support rod 201 is fixed in the positioning cavity 310 of the fan head, ensuring that the fan is in a state vertical to the ground, so that it can be used as a standing fan, table fan and wall-mounted fan. When the pitch angle of the fan needs to be adjusted, the fan head is lifted upward to completely separate the positioning cavity 310 from the support rod 201, and the second elastic member 108 and the positioning bead 109 in the fixing cavity 107 are in contact with the fixed groove to achieve the fixation of the pitch angle adjustment mechanism and the support rod 201. Then, the fan head is rotated, and the rotation of the fan head is controlled by the connection The rod 311 drives the adjustment disk 102 to rotate. When the required pitch angle is adjusted, the first elastic member 105 and the adjustment bead 106 cooperate to fix the fan at different angles, thereby completing the adjustment of the fan's pitch angle. In addition, when the user operates the fan to adjust the pitch angle, the limit block 103 cooperates with the limit slot 1023 to limit the range of pitch angle adjustment, thereby preventing the pitch angle adjustment mechanism from being damaged or even the fan from being damaged due to improper operation by the user. In addition, when the fan is in a tilted state, that is, after the pitch angle is adjusted, air can enter the fan head from both the first air inlet 303 and the second air inlet 304, thereby increasing the wind speed.

[0043] When you want to restore the fan to a state perpendicular to the ground, first rotate the fan head in the opposite direction of the pitch angle, that is, when adjusting the pitch angle, the fan rotates clockwise, and restoring it to its original position means rotating the fan head counterclockwise. During the rotation process, the cooperation between the limit block 103 and the limit slot 1023 can ensure that the fan does not rotate excessively. After completing the restoration of the pitch angle, press the fan head downward so that the support rod 201 is in the positioning cavity 310, and at the same time ensure that the second elastic member 108 and the positioning bead 109 in the fixing cavity 107 are in contact with the fixing groove 202 to complete the fixation of the fan head. The cooperation between the positioning cavity 310 and the support rod 201 can also further enhance the stability of the fan. When the fan head is restored to a state perpendicular to the ground, the second air inlet 304 is located directly above the fan base and contacts the fan base, and air cannot continue to enter. At this time, air only enters through the first air inlet 303, and since a filter 305 is installed at the first air inlet 303, the airflow entering the fan head is filtered to achieve the effect of an air purifier.

[0044] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0045] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0046] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A pitch angle adjustment mechanism, characterized in that: include: A base (101) is provided, on which an adjusting disk (102) is rotatably mounted. The outer edge of the adjusting disk (102) comprises a gear portion (1021) and a locking arc portion (1022). An adjusting groove (104) is fixedly mounted on the base (101) beside the adjusting disk (102). One end of a first elastic member (105) is fixedly mounted on the bottom of the adjusting groove (104). An adjusting bead (106) is fixedly mounted on the other end of the first elastic member (105). The adjusting bead (106) is slidably connected to a tooth gap corresponding to the gear teeth of the gear portion (1021). A limiting groove (1023) is provided on the locking arc portion (1022), and a limiting block (103) matched with the limiting groove (1023) is fixedly mounted on the base (101) at a position corresponding to the limiting groove (1023). The adjusting disk (102) is circular.

2. A fan, characterized in that: A pitch angle adjustment mechanism as described in claim 1 is used, wherein the fan comprises a fan head, a fan seat and an internal hollow support rod (201) for connecting the fan head and the fan seat, the pitch angle adjustment mechanism is installed in the support rod (201), the base (101) is movably installed on the side wall inside the support rod (201) close to the fan head, a connecting hole (203) is opened on the side wall of the support rod (201) where the adjustment disk (102) is located, a connecting rod (311) is fixedly installed on the fan head, and the connecting rod (311) is fixedly connected to the adjustment disk (102).

3. The fan according to claim 2, characterized in that The fan head comprises a shell (301), and the shell (301) is provided with an air outlet (302), a first air inlet (303) and a second air inlet (304), the air outlet (302) is opened at the top of the shell (301), the first air inlet (303) is opened on the side wall of the shell (301), and the second air inlet (304) is opened at the bottom of the shell (301). The fan head also comprises an air supply mechanism fixedly installed in the shell (301).

4. The fan according to claim 3, characterized in that The first air inlet (303) is opened at the lower part of the shell (301), and a mounting bracket (306) is fixedly mounted on the inner wall of the shell (301) above the first air inlet (303), and the air supply mechanism is fixedly mounted on the mounting bracket (306).

5. The fan according to claim 3, characterized in that A mounting platform (3011) is fixedly mounted on the bottom of the inner wall of the housing (301), and a filter (305) is fixedly mounted on the mounting platform (3011). The height of the filter (305) is consistent with the height of the first air inlet (303).

6. The fan according to claim 2, characterized in that A positioning cavity (310) is fixedly installed on the outer wall of the housing (301) at the top end of the support rod (201), the connecting hole (203) is opened along the axis of the support rod (201), the length of the connecting hole (203) is greater than or equal to the height of the positioning cavity (310), and the inner diameter of the positioning cavity (310) is consistent with the outer diameter of the support rod (201).

7. The fan according to claim 6, characterized in that A fixing cavity (107) is fixedly installed on the base (101), a second elastic member (108) is provided in the fixing cavity (107), positioning beads (109) are fixedly installed at both ends of the second elastic member (108), at least two groups of fixing grooves (202) are opened inside the side walls of the support rod (201) on both sides of the base (101), the outer diameter of the positioning beads (109) is less than or equal to the inner diameter of the fixing groove (202), and the distance between the two groups of fixing grooves (202) is greater than or equal to the height of the positioning cavity (310) and less than or equal to the length of the connecting hole (203).

8. The fan according to claim 7, characterized in that A partition perpendicular to the axis of the fixed cavity (107) is fixedly installed in the middle of the fixed cavity (107), and the partition divides the fixed cavity (107) into a first cavity (1071) and a second cavity (1072). There are two second elastic members (108) and two positioning beads (109). One end of one second elastic member (108) is fixed on the partition of the first cavity (1071), and one end of the other second elastic member (108) is fixed on the partition of the second cavity (1072). The two positioning beads (109) are respectively fixed on the free ends of the two second elastic members (108).

9. The fan according to claim 2, characterized in that The fan base comprises a base plate (402), a shell (401) and a rotation drive mechanism installed between the base plate (402) and the shell (401); the support rod (201) is fixedly connected to the shell (401); the rotation drive mechanism comprises a driving motor (406), a driving wheel (405) and a driving wheel (403); a mounting plate (404) is fixed inside the shell (401); the motor (307) is fixedly installed on the mounting plate (404); the driving wheel (405) is fixedly connected to the output shaft of the motor (307); the driving wheel (403) is fixedly installed on the base plate (402); the driving wheel (405) is meshed with the driving wheel (403); the number of teeth of the driving wheel (403) is greater than the number of teeth of the driving wheel (405); and the base plate (402) and the shell (401) are rotatably installed.

10. The fan according to claim 9, characterized in that A clamping block (204) is fixedly installed at the bottom of the side wall of the support rod (201) close to the fan head side, a clamping groove (4011) matching the clamping block (204) is provided on the side wall of the shell (401), a connecting port (407) is provided at the bottom end of the base plate (402), and a bracket (501) is also included, and the bracket (501) is detachably connected to the connecting port (407).

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